git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/inftlmount.c

   1 /*
   2  * inftlmount.c -- INFTL mount code with extensive checks.
   3  *
   4  * Author: Greg Ungerer (gerg@snapgear.com)
   5  * (C) Copyright 2002-2003, Greg Ungerer (gerg@snapgear.com)
   6  *
   7  * Based heavily on the nftlmount.c code which is:
   8  * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
   9  * Copyright (C) 2000 Netgem S.A.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <asm/errno.h>
  29 #include <asm/io.h>
  30 #include <asm/uaccess.h>
  31 #include <linux/miscdevice.h>
  32 #include <linux/delay.h>
  33 #include <linux/slab.h>
  34 #include <linux/init.h>
  35 #include <linux/mtd/mtd.h>
  36 #include <linux/mtd/nftl.h>
  37 #include <linux/mtd/inftl.h>
  38 #include <linux/mtd/compatmac.h>
  39
  40 /*
  41  * find_boot_record: Find the INFTL Media Header and its Spare copy which
  42  *      contains the various device information of the INFTL partition and
  43  *      Bad Unit Table. Update the PUtable[] table according to the Bad
  44  *      Unit Table. PUtable[] is used for management of Erase Unit in
  45  *      other routines in inftlcore.c and inftlmount.c.
  46  */
  47 static int find_boot_record(struct INFTLrecord *inftl)
  48 {
  49         struct inftl_unittail h1;
  50         //struct inftl_oob oob;
  51         unsigned int i, block;
  52         u8 buf[SECTORSIZE];
  53         struct INFTLMediaHeader *mh = &inftl->MediaHdr;
  54         struct mtd_info *mtd = inftl->mbd.mtd;
  55         struct INFTLPartition *ip;
  56         size_t retlen;
  57
  58         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: find_boot_record(inftl=%p)\n", inftl);
  59
  60         /*
  61          * Assume logical EraseSize == physical erasesize for starting the
  62          * scan. We'll sort it out later if we find a MediaHeader which says
  63          * otherwise.
  64          */
  65         inftl->EraseSize = inftl->mbd.mtd->erasesize;
  66         inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
  67
  68         inftl->MediaUnit = BLOCK_NIL;
  69
  70         /* Search for a valid boot record */
  71         for (block = 0; block < inftl->nb_blocks; block++) {
  72                 int ret;
  73
  74                 /*
  75                  * Check for BNAND header first. Then whinge if it's found
  76                  * but later checks fail.
  77                  */
  78                 ret = mtd->read(mtd, block * inftl->EraseSize,
  79                                 SECTORSIZE, &retlen, buf);
  80                 /* We ignore ret in case the ECC of the MediaHeader is invalid
  81                    (which is apparently acceptable) */
  82                 if (retlen != SECTORSIZE) {
  83                         static int warncount = 5;
  84
  85                         if (warncount) {
  86                                 printk(KERN_WARNING "INFTL: block read at 0x%x "
  87                                         "of mtd%d failed: %d\n",
  88                                         block * inftl->EraseSize,
  89                                         inftl->mbd.mtd->index, ret);
  90                                 if (!--warncount)
  91                                         printk(KERN_WARNING "INFTL: further "
  92                                                 "failures for this block will "
  93                                                 "not be printed\n");
  94                         }
  95                         continue;
  96                 }
  97
  98                 if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
  99                         /* BNAND\0 not found. Continue */
 100                         continue;
 101                 }
 102
 103                 /* To be safer with BIOS, also use erase mark as discriminant */
 104                 if ((ret = inftl_read_oob(mtd, block * inftl->EraseSize +
 105                                           SECTORSIZE + 8, 8, &retlen,
 106                                           (char *)&h1) < 0)) {
 107                         printk(KERN_WARNING "INFTL: ANAND header found at "
 108                                 "0x%x in mtd%d, but OOB data read failed "
 109                                 "(err %d)\n", block * inftl->EraseSize,
 110                                 inftl->mbd.mtd->index, ret);
 111                         continue;
 112                 }
 113
 114
 115                 /*
 116                  * This is the first we've seen.
 117                  * Copy the media header structure into place.
 118                  */
 119                 memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
 120
 121                 /* Read the spare media header at offset 4096 */
 122                 mtd->read(mtd, block * inftl->EraseSize + 4096,
 123                           SECTORSIZE, &retlen, buf);
 124                 if (retlen != SECTORSIZE) {
 125                         printk(KERN_WARNING "INFTL: Unable to read spare "
 126                                "Media Header\n");
 127                         return -1;
 128                 }
 129                 /* Check if this one is the same as the first one we found. */
 130                 if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
 131                         printk(KERN_WARNING "INFTL: Primary and spare Media "
 132                                "Headers disagree.\n");
 133                         return -1;
 134                 }
 135
 136                 mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
 137                 mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
 138                 mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
 139                 mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
 140                 mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
 141                 mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
 142
 143 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 144                 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
 145                         printk("INFTL: Media Header ->\n"
 146                                 "    bootRecordID          = %s\n"
 147                                 "    NoOfBootImageBlocks   = %d\n"
 148                                 "    NoOfBinaryPartitions  = %d\n"
 149                                 "    NoOfBDTLPartitions    = %d\n"
 150                                 "    BlockMultiplerBits    = %d\n"
 151                                 "    FormatFlgs            = %d\n"
 152                                 "    OsakVersion           = 0x%x\n"
 153                                 "    PercentUsed           = %d\n",
 154                                 mh->bootRecordID, mh->NoOfBootImageBlocks,
 155                                 mh->NoOfBinaryPartitions,
 156                                 mh->NoOfBDTLPartitions,
 157                                 mh->BlockMultiplierBits, mh->FormatFlags,
 158                                 mh->OsakVersion, mh->PercentUsed);
 159                 }
 160 #endif
 161
 162                 if (mh->NoOfBDTLPartitions == 0) {
 163                         printk(KERN_WARNING "INFTL: Media Header sanity check "
 164                                 "failed: NoOfBDTLPartitions (%d) == 0, "
 165                                 "must be at least 1\n", mh->NoOfBDTLPartitions);
 166                         return -1;
 167                 }
 168
 169                 if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
 170                         printk(KERN_WARNING "INFTL: Media Header sanity check "
 171                                 "failed: Total Partitions (%d) > 4, "
 172                                 "BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
 173                                 mh->NoOfBinaryPartitions,
 174                                 mh->NoOfBDTLPartitions,
 175                                 mh->NoOfBinaryPartitions);
 176                         return -1;
 177                 }
 178
 179                 if (mh->BlockMultiplierBits > 1) {
 180                         printk(KERN_WARNING "INFTL: sorry, we don't support "
 181                                 "UnitSizeFactor 0x%02x\n",
 182                                 mh->BlockMultiplierBits);
 183                         return -1;
 184                 } else if (mh->BlockMultiplierBits == 1) {
 185                         printk(KERN_WARNING "INFTL: support for INFTL with "
 186                                 "UnitSizeFactor 0x%02x is experimental\n",
 187                                 mh->BlockMultiplierBits);
 188                         inftl->EraseSize = inftl->mbd.mtd->erasesize <<
 189                                 mh->BlockMultiplierBits;
 190                         inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
 191                         block >>= mh->BlockMultiplierBits;
 192                 }
 193
 194                 /* Scan the partitions */
 195                 for (i = 0; (i < 4); i++) {
 196                         ip = &mh->Partitions[i];
 197                         ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
 198                         ip->firstUnit = le32_to_cpu(ip->firstUnit);
 199                         ip->lastUnit = le32_to_cpu(ip->lastUnit);
 200                         ip->flags = le32_to_cpu(ip->flags);
 201                         ip->spareUnits = le32_to_cpu(ip->spareUnits);
 202                         ip->Reserved0 = le32_to_cpu(ip->Reserved0);
 203
 204 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 205                         if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
 206                                 printk("    PARTITION[%d] ->\n"
 207                                         "        virtualUnits    = %d\n"
 208                                         "        firstUnit       = %d\n"
 209                                         "        lastUnit        = %d\n"
 210                                         "        flags           = 0x%x\n"
 211                                         "        spareUnits      = %d\n",
 212                                         i, ip->virtualUnits, ip->firstUnit,
 213                                         ip->lastUnit, ip->flags,
 214                                         ip->spareUnits);
 215                         }
 216 #endif
 217
 218                         if (ip->Reserved0 != ip->firstUnit) {
 219                                 struct erase_info *instr = &inftl->instr;
 220
 221                                 instr->mtd = inftl->mbd.mtd;
 222
 223                                 /*
 224                                  *      Most likely this is using the
 225                                  *      undocumented qiuck mount feature.
 226                                  *      We don't support that, we will need
 227                                  *      to erase the hidden block for full
 228                                  *      compatibility.
 229                                  */
 230                                 instr->addr = ip->Reserved0 * inftl->EraseSize;
 231                                 instr->len = inftl->EraseSize;
 232                                 mtd->erase(mtd, instr);
 233                         }
 234                         if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
 235                                 printk(KERN_WARNING "INFTL: Media Header "
 236                                         "Partition %d sanity check failed\n"
 237                                         "    firstUnit %d : lastUnit %d  >  "
 238                                         "virtualUnits %d\n", i, ip->lastUnit,
 239                                         ip->firstUnit, ip->Reserved0);
 240                                 return -1;
 241                         }
 242                         if (ip->Reserved1 != 0) {
 243                                 printk(KERN_WARNING "INFTL: Media Header "
 244                                         "Partition %d sanity check failed: "
 245                                         "Reserved1 %d != 0\n",
 246                                         i, ip->Reserved1);
 247                                 return -1;
 248                         }
 249
 250                         if (ip->flags & INFTL_BDTL)
 251                                 break;
 252                 }
 253
 254                 if (i >= 4) {
 255                         printk(KERN_WARNING "INFTL: Media Header Partition "
 256                                 "sanity check failed:\n       No partition "
 257                                 "marked as Disk Partition\n");
 258                         return -1;
 259                 }
 260
 261                 inftl->nb_boot_blocks = ip->firstUnit;
 262                 inftl->numvunits = ip->virtualUnits;
 263                 if (inftl->numvunits > (inftl->nb_blocks -
 264                     inftl->nb_boot_blocks - 2)) {
 265                         printk(KERN_WARNING "INFTL: Media Header sanity check "
 266                                 "failed:\n        numvunits (%d) > nb_blocks "
 267                                 "(%d) - nb_boot_blocks(%d) - 2\n",
 268                                 inftl->numvunits, inftl->nb_blocks,
 269                                 inftl->nb_boot_blocks);
 270                         return -1;
 271                 }
 272
 273                 inftl->mbd.size  = inftl->numvunits *
 274                         (inftl->EraseSize / SECTORSIZE);
 275
 276                 /*
 277                  * Block count is set to last used EUN (we won't need to keep
 278                  * any meta-data past that point).
 279                  */
 280                 inftl->firstEUN = ip->firstUnit;
 281                 inftl->lastEUN = ip->lastUnit;
 282                 inftl->nb_blocks = ip->lastUnit + 1;
 283
 284                 /* Memory alloc */
 285                 inftl->PUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
 286                 if (!inftl->PUtable) {
 287                         printk(KERN_WARNING "INFTL: allocation of PUtable "
 288                                 "failed (%zd bytes)\n",
 289                                 inftl->nb_blocks * sizeof(u16));
 290                         return -ENOMEM;
 291                 }
 292
 293                 inftl->VUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
 294                 if (!inftl->VUtable) {
 295                         kfree(inftl->PUtable);
 296                         printk(KERN_WARNING "INFTL: allocation of VUtable "
 297                                 "failed (%zd bytes)\n",
 298                                 inftl->nb_blocks * sizeof(u16));
 299                         return -ENOMEM;
 300                 }
 301
 302                 /* Mark the blocks before INFTL MediaHeader as reserved */
 303                 for (i = 0; i < inftl->nb_boot_blocks; i++)
 304                         inftl->PUtable[i] = BLOCK_RESERVED;
 305                 /* Mark all remaining blocks as potentially containing data */
 306                 for (; i < inftl->nb_blocks; i++)
 307                         inftl->PUtable[i] = BLOCK_NOTEXPLORED;
 308
 309                 /* Mark this boot record (NFTL MediaHeader) block as reserved */
 310                 inftl->PUtable[block] = BLOCK_RESERVED;
 311
 312                 /* Read Bad Erase Unit Table and modify PUtable[] accordingly */
 313                 for (i = 0; i < inftl->nb_blocks; i++) {
 314                         int physblock;
 315                         /* If any of the physical eraseblocks are bad, don't
 316                            use the unit. */
 317                         for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
 318                                 if (inftl->mbd.mtd->block_isbad(inftl->mbd.mtd, i * inftl->EraseSize + physblock))
 319                                         inftl->PUtable[i] = BLOCK_RESERVED;
 320                         }
 321                 }
 322
 323                 inftl->MediaUnit = block;
 324                 return 0;
 325         }
 326
 327         /* Not found. */
 328         return -1;
 329 }
 330
 331 static int memcmpb(void *a, int c, int n)
 332 {
 333         int i;
 334         for (i = 0; i < n; i++) {
 335                 if (c != ((unsigned char *)a)[i])
 336                         return 1;
 337         }
 338         return 0;
 339 }
 340
 341 /*
 342  * check_free_sector: check if a free sector is actually FREE,
 343  *      i.e. All 0xff in data and oob area.
 344  */
 345 static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
 346         int len, int check_oob)
 347 {
 348         u8 buf[SECTORSIZE + inftl->mbd.mtd->oobsize];
 349         struct mtd_info *mtd = inftl->mbd.mtd;
 350         size_t retlen;
 351         int i;
 352
 353         for (i = 0; i < len; i += SECTORSIZE) {
 354                 if (mtd->read(mtd, address, SECTORSIZE, &retlen, buf))
 355                         return -1;
 356                 if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
 357                         return -1;
 358
 359                 if (check_oob) {
 360                         if(inftl_read_oob(mtd, address, mtd->oobsize,
 361                                           &retlen, &buf[SECTORSIZE]) < 0)
 362                                 return -1;
 363                         if (memcmpb(buf + SECTORSIZE, 0xff, mtd->oobsize) != 0)
 364                                 return -1;
 365                 }
 366                 address += SECTORSIZE;
 367         }
 368
 369         return 0;
 370 }
 371
 372 /*
 373  * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
 374  *               Unit and Update INFTL metadata. Each erase operation is
 375  *               checked with check_free_sectors.
 376  *
 377  * Return: 0 when succeed, -1 on error.
 378  *
 379  * ToDo: 1. Is it neceressary to check_free_sector after erasing ??
 380  */
 381 int INFTL_formatblock(struct INFTLrecord *inftl, int block)
 382 {
 383         size_t retlen;
 384         struct inftl_unittail uci;
 385         struct erase_info *instr = &inftl->instr;
 386         struct mtd_info *mtd = inftl->mbd.mtd;
 387         int physblock;
 388
 389         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_formatblock(inftl=%p,"
 390                 "block=%d)\n", inftl, block);
 391
 392         memset(instr, 0, sizeof(struct erase_info));
 393
 394         /* FIXME: Shouldn't we be setting the 'discarded' flag to zero
 395            _first_? */
 396
 397         /* Use async erase interface, test return code */
 398         instr->mtd = inftl->mbd.mtd;
 399         instr->addr = block * inftl->EraseSize;
 400         instr->len = inftl->mbd.mtd->erasesize;
 401         /* Erase one physical eraseblock at a time, even though the NAND api
 402            allows us to group them.  This way we if we have a failure, we can
 403            mark only the failed block in the bbt. */
 404         for (physblock = 0; physblock < inftl->EraseSize;
 405              physblock += instr->len, instr->addr += instr->len) {
 406                 mtd->erase(inftl->mbd.mtd, instr);
 407
 408                 if (instr->state == MTD_ERASE_FAILED) {
 409                         printk(KERN_WARNING "INFTL: error while formatting block %d\n",
 410                                 block);
 411                         goto fail;
 412                 }
 413
 414                 /*
 415                  * Check the "freeness" of Erase Unit before updating metadata.
 416                  * FixMe: is this check really necessary? Since we have check
 417                  * the return code after the erase operation.
 418                  */
 419                 if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
 420                         goto fail;
 421         }
 422
 423         uci.EraseMark = cpu_to_le16(ERASE_MARK);
 424         uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
 425         uci.Reserved[0] = 0;
 426         uci.Reserved[1] = 0;
 427         uci.Reserved[2] = 0;
 428         uci.Reserved[3] = 0;
 429         instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
 430         if (inftl_write_oob(mtd, instr->addr + 8, 8, &retlen, (char *)&uci) < 0)
 431                 goto fail;
 432         return 0;
 433 fail:
 434         /* could not format, update the bad block table (caller is responsible
 435            for setting the PUtable to BLOCK_RESERVED on failure) */
 436         inftl->mbd.mtd->block_markbad(inftl->mbd.mtd, instr->addr);
 437         return -1;
 438 }
 439
 440 /*
 441  * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
 442  *      Units in a Virtual Unit Chain, i.e. all the units are disconnected.
 443  *
 444  *      Since the chain is invalid then we will have to erase it from its
 445  *      head (normally for INFTL we go from the oldest). But if it has a
 446  *      loop then there is no oldest...
 447  */
 448 static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
 449 {
 450         unsigned int block = first_block, block1;
 451
 452         printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
 453                 first_block);
 454
 455         for (;;) {
 456                 block1 = inftl->PUtable[block];
 457
 458                 printk(KERN_WARNING "INFTL: formatting block %d\n", block);
 459                 if (INFTL_formatblock(inftl, block) < 0) {
 460                         /*
 461                          * Cannot format !!!! Mark it as Bad Unit,
 462                          */
 463                         inftl->PUtable[block] = BLOCK_RESERVED;
 464                 } else {
 465                         inftl->PUtable[block] = BLOCK_FREE;
 466                 }
 467
 468                 /* Goto next block on the chain */
 469                 block = block1;
 470
 471                 if (block == BLOCK_NIL || block >= inftl->lastEUN)
 472                         break;
 473         }
 474 }
 475
 476 void INFTL_dumptables(struct INFTLrecord *s)
 477 {
 478         int i;
 479
 480         printk("-------------------------------------------"
 481                 "----------------------------------\n");
 482
 483         printk("VUtable[%d] ->", s->nb_blocks);
 484         for (i = 0; i < s->nb_blocks; i++) {
 485                 if ((i % 8) == 0)
 486                         printk("\n%04x: ", i);
 487                 printk("%04x ", s->VUtable[i]);
 488         }
 489
 490         printk("\n-------------------------------------------"
 491                 "----------------------------------\n");
 492
 493         printk("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
 494         for (i = 0; i <= s->lastEUN; i++) {
 495                 if ((i % 8) == 0)
 496                         printk("\n%04x: ", i);
 497                 printk("%04x ", s->PUtable[i]);
 498         }
 499
 500         printk("\n-------------------------------------------"
 501                 "----------------------------------\n");
 502
 503         printk("INFTL ->\n"
 504                 "  EraseSize       = %d\n"
 505                 "  h/s/c           = %d/%d/%d\n"
 506                 "  numvunits       = %d\n"
 507                 "  firstEUN        = %d\n"
 508                 "  lastEUN         = %d\n"
 509                 "  numfreeEUNs     = %d\n"
 510                 "  LastFreeEUN     = %d\n"
 511                 "  nb_blocks       = %d\n"
 512                 "  nb_boot_blocks  = %d",
 513                 s->EraseSize, s->heads, s->sectors, s->cylinders,
 514                 s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
 515                 s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
 516
 517         printk("\n-------------------------------------------"
 518                 "----------------------------------\n");
 519 }
 520
 521 void INFTL_dumpVUchains(struct INFTLrecord *s)
 522 {
 523         int logical, block, i;
 524
 525         printk("-------------------------------------------"
 526                 "----------------------------------\n");
 527
 528         printk("INFTL Virtual Unit Chains:\n");
 529         for (logical = 0; logical < s->nb_blocks; logical++) {
 530                 block = s->VUtable[logical];
 531                 if (block > s->nb_blocks)
 532                         continue;
 533                 printk("  LOGICAL %d --> %d ", logical, block);
 534                 for (i = 0; i < s->nb_blocks; i++) {
 535                         if (s->PUtable[block] == BLOCK_NIL)
 536                                 break;
 537                         block = s->PUtable[block];
 538                         printk("%d ", block);
 539                 }
 540                 printk("\n");
 541         }
 542
 543         printk("-------------------------------------------"
 544                 "----------------------------------\n");
 545 }
 546
 547 int INFTL_mount(struct INFTLrecord *s)
 548 {
 549         struct mtd_info *mtd = s->mbd.mtd;
 550         unsigned int block, first_block, prev_block, last_block;
 551         unsigned int first_logical_block, logical_block, erase_mark;
 552         int chain_length, do_format_chain;
 553         struct inftl_unithead1 h0;
 554         struct inftl_unittail h1;
 555         size_t retlen;
 556         int i;
 557         u8 *ANACtable, ANAC;
 558
 559         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_mount(inftl=%p)\n", s);
 560
 561         /* Search for INFTL MediaHeader and Spare INFTL Media Header */
 562         if (find_boot_record(s) < 0) {
 563                 printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
 564                 return -ENXIO;
 565         }
 566
 567         /* Init the logical to physical table */
 568         for (i = 0; i < s->nb_blocks; i++)
 569                 s->VUtable[i] = BLOCK_NIL;
 570
 571         logical_block = block = BLOCK_NIL;
 572
 573         /* Temporary buffer to store ANAC numbers. */
 574         ANACtable = kcalloc(s->nb_blocks, sizeof(u8), GFP_KERNEL);
 575         if (!ANACtable) {
 576                 printk(KERN_WARNING "INFTL: allocation of ANACtable "
 577                                 "failed (%zd bytes)\n",
 578                                 s->nb_blocks * sizeof(u8));
 579                 return -ENOMEM;
 580         }
 581
 582         /*
 583          * First pass is to explore each physical unit, and construct the
 584          * virtual chains that exist (newest physical unit goes into VUtable).
 585          * Any block that is in any way invalid will be left in the
 586          * NOTEXPLORED state. Then at the end we will try to format it and
 587          * mark it as free.
 588          */
 589         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 1, explore each unit\n");
 590         for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
 591                 if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
 592                         continue;
 593
 594                 do_format_chain = 0;
 595                 first_logical_block = BLOCK_NIL;
 596                 last_block = BLOCK_NIL;
 597                 block = first_block;
 598
 599                 for (chain_length = 0; ; chain_length++) {
 600
 601                         if ((chain_length == 0) &&
 602                             (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
 603                                 /* Nothing to do here, onto next block */
 604                                 break;
 605                         }
 606
 607                         if (inftl_read_oob(mtd, block * s->EraseSize + 8,
 608                                            8, &retlen, (char *)&h0) < 0 ||
 609                             inftl_read_oob(mtd, block * s->EraseSize +
 610                                            2 * SECTORSIZE + 8, 8, &retlen,
 611                                            (char *)&h1) < 0) {
 612                                 /* Should never happen? */
 613                                 do_format_chain++;
 614                                 break;
 615                         }
 616
 617                         logical_block = le16_to_cpu(h0.virtualUnitNo);
 618                         prev_block = le16_to_cpu(h0.prevUnitNo);
 619                         erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
 620                         ANACtable[block] = h0.ANAC;
 621
 622                         /* Previous block is relative to start of Partition */
 623                         if (prev_block < s->nb_blocks)
 624                                 prev_block += s->firstEUN;
 625
 626                         /* Already explored partial chain? */
 627                         if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
 628                                 /* Check if chain for this logical */
 629                                 if (logical_block == first_logical_block) {
 630                                         if (last_block != BLOCK_NIL)
 631                                                 s->PUtable[last_block] = block;
 632                                 }
 633                                 break;
 634                         }
 635
 636                         /* Check for invalid block */
 637                         if (erase_mark != ERASE_MARK) {
 638                                 printk(KERN_WARNING "INFTL: corrupt block %d "
 639                                         "in chain %d, chain length %d, erase "
 640                                         "mark 0x%x?\n", block, first_block,
 641                                         chain_length, erase_mark);
 642                                 /*
 643                                  * Assume end of chain, probably incomplete
 644                                  * fold/erase...
 645                                  */
 646                                 if (chain_length == 0)
 647                                         do_format_chain++;
 648                                 break;
 649                         }
 650
 651                         /* Check for it being free already then... */
 652                         if ((logical_block == BLOCK_FREE) ||
 653                             (logical_block == BLOCK_NIL)) {
 654                                 s->PUtable[block] = BLOCK_FREE;
 655                                 break;
 656                         }
 657
 658                         /* Sanity checks on block numbers */
 659                         if ((logical_block >= s->nb_blocks) ||
 660                             ((prev_block >= s->nb_blocks) &&
 661                              (prev_block != BLOCK_NIL))) {
 662                                 if (chain_length > 0) {
 663                                         printk(KERN_WARNING "INFTL: corrupt "
 664                                                 "block %d in chain %d?\n",
 665                                                 block, first_block);
 666                                         do_format_chain++;
 667                                 }
 668                                 break;
 669                         }
 670
 671                         if (first_logical_block == BLOCK_NIL) {
 672                                 first_logical_block = logical_block;
 673                         } else {
 674                                 if (first_logical_block != logical_block) {
 675                                         /* Normal for folded chain... */
 676                                         break;
 677                                 }
 678                         }
 679
 680                         /*
 681                          * Current block is valid, so if we followed a virtual
 682                          * chain to get here then we can set the previous
 683                          * block pointer in our PUtable now. Then move onto
 684                          * the previous block in the chain.
 685                          */
 686                         s->PUtable[block] = BLOCK_NIL;
 687                         if (last_block != BLOCK_NIL)
 688                                 s->PUtable[last_block] = block;
 689                         last_block = block;
 690                         block = prev_block;
 691
 692                         /* Check for end of chain */
 693                         if (block == BLOCK_NIL)
 694                                 break;
 695
 696                         /* Validate next block before following it... */
 697                         if (block > s->lastEUN) {
 698                                 printk(KERN_WARNING "INFTL: invalid previous "
 699                                         "block %d in chain %d?\n", block,
 700                                         first_block);
 701                                 do_format_chain++;
 702                                 break;
 703                         }
 704                 }
 705
 706                 if (do_format_chain) {
 707                         format_chain(s, first_block);
 708                         continue;
 709                 }
 710
 711                 /*
 712                  * Looks like a valid chain then. It may not really be the
 713                  * newest block in the chain, but it is the newest we have
 714                  * found so far. We might update it in later iterations of
 715                  * this loop if we find something newer.
 716                  */
 717                 s->VUtable[first_logical_block] = first_block;
 718                 logical_block = BLOCK_NIL;
 719         }
 720
 721 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 722         if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
 723                 INFTL_dumptables(s);
 724 #endif
 725
 726         /*
 727          * Second pass, check for infinite loops in chains. These are
 728          * possible because we don't update the previous pointers when
 729          * we fold chains. No big deal, just fix them up in PUtable.
 730          */
 731         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 2, validate virtual chains\n");
 732         for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
 733                 block = s->VUtable[logical_block];
 734                 last_block = BLOCK_NIL;
 735
 736                 /* Check for free/reserved/nil */
 737                 if (block >= BLOCK_RESERVED)
 738                         continue;
 739
 740                 ANAC = ANACtable[block];
 741                 for (i = 0; i < s->numvunits; i++) {
 742                         if (s->PUtable[block] == BLOCK_NIL)
 743                                 break;
 744                         if (s->PUtable[block] > s->lastEUN) {
 745                                 printk(KERN_WARNING "INFTL: invalid prev %d, "
 746                                         "in virtual chain %d\n",
 747                                         s->PUtable[block], logical_block);
 748                                 s->PUtable[block] = BLOCK_NIL;
 749
 750                         }
 751                         if (ANACtable[block] != ANAC) {
 752                                 /*
 753                                  * Chain must point back to itself. This is ok,
 754                                  * but we will need adjust the tables with this
 755                                  * newest block and oldest block.
 756                                  */
 757                                 s->VUtable[logical_block] = block;
 758                                 s->PUtable[last_block] = BLOCK_NIL;
 759                                 break;
 760                         }
 761
 762                         ANAC--;
 763                         last_block = block;
 764                         block = s->PUtable[block];
 765                 }
 766
 767                 if (i >= s->nb_blocks) {
 768                         /*
 769                          * Uhoo, infinite chain with valid ANACS!
 770                          * Format whole chain...
 771                          */
 772                         format_chain(s, first_block);
 773                 }
 774         }
 775
 776 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 777         if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
 778                 INFTL_dumptables(s);
 779         if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
 780                 INFTL_dumpVUchains(s);
 781 #endif
 782
 783         /*
 784          * Third pass, format unreferenced blocks and init free block count.
 785          */
 786         s->numfreeEUNs = 0;
 787         s->LastFreeEUN = BLOCK_NIL;
 788
 789         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 3, format unused blocks\n");
 790         for (block = s->firstEUN; block <= s->lastEUN; block++) {
 791                 if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
 792                         printk("INFTL: unreferenced block %d, formatting it\n",
 793                                 block);
 794                         if (INFTL_formatblock(s, block) < 0)
 795                                 s->PUtable[block] = BLOCK_RESERVED;
 796                         else
 797                                 s->PUtable[block] = BLOCK_FREE;
 798                 }
 799                 if (s->PUtable[block] == BLOCK_FREE) {
 800                         s->numfreeEUNs++;
 801                         if (s->LastFreeEUN == BLOCK_NIL)
 802                                 s->LastFreeEUN = block;
 803                 }
 804         }
 805
 806         kfree(ANACtable);
 807         return 0;
 808 }